Hey Matt the 267 mounts on the front of the block. The 350 mounts on the side. The side mounts are much better than the front mounts so there's no point in buiding front mounts just for a test run. The 350 distributor needs more clearance than the 267 and may hit the firewall if you set it up for a 267.
Before you paint it weld the back doors shut and cut off the roof with a sawsall. Then maybe people will notice it.
AL